If you hold the yarn you're not using up against the side of the scarf with the new yarn--basically bring the new color up under the old strand, it kind of holds the carried color close to the edge of the scarf to prevent a loop. You will still see the color, but not as much.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry